I was suggesting the hexdump utility to determine several things: 1) Which disk contained the extfs magic header (thus the first disk in almost all cases) 2) Where the start of that header was, which would /typically/ begin after 1kb of padding (it's there for other things to use in some cases). 3) If created properly, the extfs header /may/ give you a suggested stripe/chunk size. As an example... http://www.virtualblueness.net/Ext2fs-overview/Ext2fs-overview-0.1-12.html http://www.monstrmoose.com/repository/Halo_Tools/Etc/WinHex_15.1/Ext%20Superblock.tpl (0x400 == 1024) Looking at the blocks, in the standard output the 'magic signature' should be in the 4th row, starting halfway across, which it is for even ext4 filesystems. Typically, but not always, there is zero-filled padding around this area; as denoted by the line of 0s and then the * indicating that the last line repeats until the next address. hexdump -Cn2048 /dev/mapper/lin-lucid--root_crypt 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000400 90 97 05 00 ff 56 16 00 f3 1d 01 00 a3 4b 04 00 |.....V.......K..| 00000410 2f 95 02 00 00 00 00 00 02 00 00 00 02 00 00 00 |/...............| 00000420 00 80 00 00 00 80 00 00 d0 1f 00 00 ec 1e e6 4b |...............K| 00000430 32 d3 e0 4b 11 00 1f 00 53 ef -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
